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Allele Dev authored
Makes several corrections to post 59, and adds example code with tests to ensure the post content is correct. In particular: * links to code early in the post * adds necessary imports early in the post * removes `Alternative` instance for `Xor` * rename `f` and `f2` to more descriptive names * avoids name-shadowing later * fixes the implementation of most Validation helper functions * previously returned: `[Validation NumberError a]` * needed: `Validation [NumberError] a` * corrected the subsequent examples * fixed one erroneous example * spelling: let's -> lets